Malicious PDF — malware analysis report

Static analysis result for SHA-256 7424d8b95ac6400a…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 19:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: da8f85da12b31bdbfb2579304fba86c8 SHA-1: 388daa3248b0606e51d032c5596451d7217c48e7 SHA-256: 7424d8b95ac6400a6e6e99151e7cf1b60499f73615751407f3581b7dfecfba39
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=bach+concerto+for+two+violins+sheet+music+pdf PDF link annotation
    • http://longbeach.ilovepokebar.com/uploads/files/motinibeferiret.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/43527077494.pdfIn PDF document text
    • http://normel.org/files/upload/file/34693178339.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/59253011318.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/vobuwesafezitutazizosubu.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/jobigi.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/us1j7tu99mbl946rc79mhgakhv/bigawajufomufukive.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/susejukusesovog.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/72864263623.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/45602558205.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/82434274933.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/xugol.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/16630407445.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/jedefepuzotilaxupetiwu.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/refobimig.pdfIn PDF document text
    • http://haai.org/upload/file/57162495075.pdfIn PDF document text
    • http://agmapure.com/upload/files/wewena.pdfIn PDF document text
    • http://cudicio.it/images/file/97420466648.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/74220104725.pdfIn PDF document text
    • https://kueapem.com/contents/files/lunojolixinazokoriro.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161410ee1e3fa4---xewurusibat.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/zunewixezitafodupedebepu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FE 11188 bytes
SHA-256: 19781857dc9965151daa517bb960819efc09079840454d904ce00cf6cdde26f7
font_01_sfnt_off0000ec0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 18188 bytes
SHA-256: a044ac5831fc8a5d52cfa950dac5b1114964ec0ad02f613e2e53b90891cf0bc3
font_02_sfnt_off00011b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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